Running a raw water cooled Bukh DV20 in the yard

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stevd

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Hello all,

I need to run up my Bukh DV20 in the yard, to flush the engine out and to see if it is now running ok before it goes into the water.

What is the best way of doing this? Is it best to connect a hose pip up to the water intake - if so, how do you know how much water is required. Or do you fill a bucket, and have a hose slowly filling that? Any ideas or suggestions? I have never done this before, so please dont be shy to explain the whole process :-)

Many thanks
 
Detach the hose from the Water pump, and let it suck the Water it need from a bucket, keep the bucket full with a hose. When it's been running for a while you can adjust the freshwater so the bucket is never empty but also do not overflow.

/Joms
 
Various different ways of doing it. You can take a hose from a bucket into the intake and feed the bucket from a hose (or top it up). If you have a water strainer above the engine you can close the seacock, take the lid off and fill from a bucket or hosepipe. Some people collect the water from the exhaust and pipe back into the engine. at one point I had a bucket with a skin fitting in the bottom with a hose that connected direct to the water pump. The engine will use very little water at tickover, but increases rapidly as you rev, so any replenishment needs to be versatile. If using a hose pipe from the mains, a tap at the end is useful to control the water.
 
Not to overstate it as you already have the correct information but NEVER connect a hosepipe directly to the water intake as this could result in water getting into the cylinder via the exhaust injection elbow and wrecking the motor dueto a hydraulic lock.
 
Definitely dont want to hydrolock the engine. I have had hours of fun with hydrolocked 4x4 engines in the middle of nowhere. Bucket route it is then :-)

Anything else I should know about / be cautious of?

Many thanks

Steve
 
I like to let the engine run for a good period of time, so find the initial extra time (50 seconds) to take the hose off the water strainer well worth it, and if the bucket is large you can adjust the flow of Water, but like Tranona says a tap on the end of the hose is needed.
 
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JomsViking said:
Detach the hose from the Water pump, and let it suck the Water it need from a bucket, keep the bucket full with a hose. When it's been running for a while you can adjust the freshwater so the bucket is never empty but also do not overflow.

/Joms
Click to expand...
bucket with a plastic skin fitting in the bottom to take a 1/2" hose stuff the hose in the boat engine intake Hang the bucket under the exhaust, you then have a cooling system. top up the bucket as req
 
sailorman said:
bucket with a plastic skin fitting in the bottom to take a 1/2" hose stuff the hose in the boat engine intake Hang the bucket under the exhaust, you then have a cooling system. top up the bucket as req
Click to expand...

The goldplated version.. We were so poor we had to let the engine suck the Water of a damp newspaper...
 
I'm not from Yorkshire....

I hang a bucket of water from the guardwires so that the water in it is about at boottop level. The bucket kept filled by a hose. A length of plastic pipe is led from the bucket, under the boat in a syphon mode (ie full of water) and jammed into the engine water inlet. No dismantling of the engine water inlet arrangement is involved. But you do have to monitor the water level in the bucket and be prepared to adjust rate of flow from the hose as necessary.

If your raw water cooling pump is in as new condition, it may well draw the water up from a bucket at ground level. But I find it easier to provide a bit of priming by raising it to normal water level as described.

Obvious warning: don't run the engine in gear unless you can guarantee the rotating prop won't cause a danger.
 
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All the above, but I like to have the bucket sat on the saloon sole where I can see it. The hose feeding the bucket has a garden sprayhead trigger on it so I can switch it on and off as required. Run the engine for long enough to get it thoroughly warmed up, perhaps five minutes, but not much longer . If you want to check the gear selection, you can squirt WD40 into the cutless bearing to allow you to engage fwd and reverse briefly - but have an accomplice watching the prop and keeping anyone else clear of it!

Rob.
 
I have a Vetus strainer fitted at about waterline level. This makes the job very easy. I take the lid off and let water in from a hose pipe. I leave the seacock open so any excess water just runs out through it and the level in the strainer is automatically maintained.
 
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